Have you tried to control Plex while Remote Buddy is not running? You 
should see the exact same behaviour of Plex without Remote Buddy 
running.

In general:

- Remote Buddy's Plex Behaviour doesn't know anything about which menu 
Plex is currently showing and will just send the same action/button 
event regardless of context.

- For all actions prefixed "Navigation:" the actions are 100% 
identical to those that Plex' own Apple Remote driver ("JS0:Apple 
Remote") would send to Plex (checked with the Wireshark packet sniffer).

- For all actions not prefixed with "Navigation:" it'll send events 
containing the actions that (usually) have the same name as displayed 
in Remote Buddy.

Best regards, 
Felix Schwarz